Developing a surface acoustic wave-induced microfluidic cell lysis device for point-of-care DNA amplification.

Area of Science:

• Biotechnology
• Microfluidics
• Acoustic Devices

Background:

• Efficient cell lysis is crucial for downstream molecular analysis.
• Existing methods can be time-consuming or require specialized equipment.
• Low-level cell samples present a challenge for effective lysis.

Purpose of the Study:

• To develop and optimize a microchip device for rapid cell lysis using surface acoustic waves (SAW).
• To demonstrate the efficacy of the device for direct DNA amplification from lysed samples.
• To evaluate the potential of this technology for point-of-care applications.

Main Methods:

• Fabrication of a microchip with a 13-finger pair interdigital transducer (IDT) operating at 16 MHz.
• Utilizing SAW-induced acoustic streaming and centrifugal forces with sharp-edge glass microparticles for cell disruption.
• Optimization of lysis parameters including electrical power, sample volume, particle size and concentration, and lysis time through 42 pilot experiments.

Main Results:

• Identified optimal conditions: 2.5 W electrical power, 20 μL sample volume, glass particles < 10 μm, 0.2 μg concentration, and 5-min lysis time.
• Successfully achieved direct DNA target fragment amplification from the cell lysate.
• Demonstrated a high-efficiency microchip-based cell lysis method.

Conclusions:

• The developed SAW microchip device provides an efficient method for rapid cell lysis.
• This technology, when integrated with isothermal amplification, shows significant potential for rapid point-of-care diagnostic applications.
• The optimized lysis protocol enables direct molecular analysis from low-level cell samples.